Python, 44 bytes
def f(a,x): while[print(a.index(x))]:_,*a=a
Finishes with an exception. If not allowed:
Python, 49 bytes
def f(a,x): while x in a:yield a.index(x);_,*a=a
Whython, 46 bytes
def f(a,x): while[print(a.index(x))]?0:_,*a=a
pxeger
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